Floating SquaresGraphite (from a pencil lead) is applied to one side of an index card and a piece of the card is immersed in a beaker containing hexane and water (two layers). The graphite-coated side always faces the hexane layer. When the two liquids are carbon tetrachloride and water the graphite-coated side always faces the carbon tetrachloride.

A New "Bottom-Up" Framework for Teaching Chemical BondingTami Levy Nahum, Rachel Mamlok-Naaman, Avi Hofstein, and Leeor KronikThis article presents a general framework for bonding that can be presented at different levels of sophistication depending on the student's level and needs. The pedagogical strategy for teaching this model is a "bottom-up" one, starting with basic principles and ending with specific properties.Levy Nahum, Tami; Mamlok-Naaman, Rachel; Hofstein, Avi; Kronik, Leeor. J. Chem. Educ.2008, 85, 1680.

Atomic Properties / Structure |

Covalent Bonding |

Ionic Bonding |

Lewis Structures |

Materials Science |

MO Theory |

Noncovalent Interactions

Helping Students Assess the Relative Importance of Different Intermolecular InteractionsPaul G. JasienA semi-quantitative model has been developed to estimate the relative effects of dispersion, dipoledipole interactions, and H-bonding on the normal boiling points for a series of simple, straight-chain organic compounds. Application of this model may be useful in addressing student misconceptions related to the additivity of intermolecular interactions.Jasien, Paul G. J. Chem. Educ.2008, 85, 1222.

Chemometrics |

Molecular Properties / Structure |

Noncovalent Interactions |

Physical Properties

Stilling Waves with Ordered Molecular MonolayersEd VitzThe amazing ability of a film of oil one molecule thick to dissipate the relatively large energy of water waves can be readily demonstrated, but an explanation of the effect has been elusive until recently.Vitz, Ed. J. Chem. Educ.2008, 85, 1064.

Intermolecular Forces (Netorials)Rachel Bain, Mithra Biekmohamadi, Liana Lamont, Mike Miller, Rebecca Ottosen, John Todd, and David ShawIntermolecular Forces: this is a resource in the collection "Netorials". In this resource there is a review of Lewis structures, molecular geometry, electronegativity, or molecular polarity. After that, you can learn about the forces of attraction that exist between molecules. This module explores London forces and dipole-dipole forces (including hydrogen bonds). The Netorials cover selected topics in first-year chemistry including: Chemical Reactions, Stoichiometry, Thermodynamics, Intermolecular Forces, Acids & Bases, Biomolecules, and Electrochemistry.

Noncovalent Interactions

Electrostatics Attraction (GCMP)David M. WhisnantElectrostatics Attraction: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we will correlate molecular polarity with the attraction of liquids to a charged rod. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.